问题描述：
Arriving at the bus stop, ____ waiting there.? A) a lot of people were B) he found a lot of people
Arriving at the bus stop, ____ waiting there.?
A) a lot of people were B) he found a lot of people
C) a lot of people D) people were found
Arriving at the bus stop, ____ waiting there.?
A) a lot of people were B) he found a lot of people
C) a lot of people D) people were found
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